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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings | $ 1,234.0 |  | $ 1,234.0 |  |  | $ 115.0 |
Restricted cash | 15.0 |  | $ 15.0 |  |  |  |
Total period of service |  |  | 5 years |  |  |  |
Additional period of service after first free year |  |  | 4 years |  |  |  |
General warranty period |  |  | 1 year |  |  |  |
Price allocated to remaining performance obligations | 1,305.7 |  | $ 1,305.7 |  |  |  |
Revenue recognized | 47.0 | $ 40.8 | 244.8 | $ 207.5 |  |  |
Costs capitalized as contract acquisition costs | $ 31.3 |  | $ 31.3 |  |  | 31.4 |
ASC 606 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ 115.0 |
ASC 606 | Difference between revenue euidance in effect before and after topic 606 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  | $ 40.3
ASU 2016-16 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative catch-up adjustment to retained earnings |  |  |  |  | $ 390.8 |  |

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